[1]} presciently noted that “if the dust causing the reddening [of AGNs] is produced in the nuclei of the Seyfert galaxies, there is no reason to believe that it would have the same reddening properties as dust produced in the spiral arms of our Galaxy." [2]} discovered from comparing composite spectra of radio-loud AGNs at different orientations that the reddening curve for these AGNs was substantially flatter in the UV than a typical Milky Way curve in the UV. A subsequent independent analysis by [3]} of large sample of predominantly radio-quiet SDSS AGNs also gave a reddening curve that was flatter than a typical Milky Way curve in the UV. In contrast to these results, [4]} have shown that a reddening curve which steeply rises to the far UV, like the reddening curve of the bar of the SMC bar, is an excellent fit to the reddening curve of dust associated with high-velocity outflows from AGNS (the broad absorption lines). [5]} constructed reddening curves for 14 AGNs with near-simultaneous observations from the far UV to long optical wavelengths. These show some variety in the reddening curves, but only one of the 14 AGNs had a steep SMC-like reddening curve.Sample selection has an important effect. Samples of AGNs selected by having red UV colors will naturally produce more SMC-like reddening curves. This is the case, for example, for the red AGNs considered by [6]}.
